| 氢致脆断的TEM原位拉伸观察 |
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| 引用本文： | 陈奇志,褚武扬,乔利杰,王燕斌,肖纪美. 氢致脆断的TEM原位拉伸观察[J]. 金属学报, 1994, 30(6): 248-256 |
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| 作者姓名： | 陈奇志 褚武扬 乔利杰 王燕斌 肖纪美 |
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| 作者单位： | 北京科技大学 |
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| 摘 要： | 通过对预充氢３１０不锈钢薄膜在透射电镜下的原位拉伸观察，并和不含氢试样的结果相比较，研究了氢在韧－脆转变中的作用及氢致脆断机理，结果表明，预充氢的３１０不锈钢试样在拉伸过程中从裂发射大量位错，平衡后形成无位错区；纳米级微裂纹优在ＤＦＺ中形核，微裂纹不钝化为空洞，而是通过多个微裂纹的形核及相互连接导致裂纹的脆性扩展，即氢使奥氏体不锈钢由韧变脆的根本原因是氢抑制了ＤＦＺ中纳米级微裂纹向空洞的转化。
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| 关 键 词： | 氢致脆断 微裂纹 不锈钢 TEM 拉伸 |
| 收稿时间： | 1994-06-18 |
| 修稿时间： | 1994-06-18 |
TEM IN SITU OBSERVATION OF BRITTLE CRACKING OF HYDROGEN CHARGED 310 STAINLESS STEEL UNDER TENSION |
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| CHEN QiZhi,CHU Wuyang,QIAO Lijie,WANG Yanbin,XIAO Jimei. TEM IN SITU OBSERVATION OF BRITTLE CRACKING OF HYDROGEN CHARGED 310 STAINLESS STEEL UNDER TENSION[J]. Acta Metallurgica Sinica, 1994, 30(6): 248-256 |
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| Authors: | CHEN QiZhi CHU Wuyang QIAO Lijie WANG Yanbin XIAO Jimei |
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| Affiliation: | University of Science and Technology Beijing |
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| Abstract: | The effect of hydrogen on the cracking of type 310 stainless steel was studied by TEM in situ observation of hydrogen-charged specimens and comparison with the hydrogen-free specimens.The results show that 1)in precharged specimens,many dislocations can emit from a crack tip followed by forming a dislocation free zone(DFZ) after equilibrium:2)nanocracks nucleate preferable in DFZs;3)microcracks connect with each other,resulting in the brittle cracks,instead of blunting into voids.The effect of hydrogen on the change from ductile to brittle is to prevent nanocracks in DFZs from blunting into voids. |
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| Keywords: | hydrogen-induced brittle crack microcrack TEM in situ observation dislocation free zone steel 310 |
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